🇫🇮 Helsinki, Finland
Does It Rain at Flow Festival?
Across roughly 15 years of records at the site, rain falls on about 100% of Flow days, averaging 1.9mm a day.
The short answer
100%
of days see 1mm+
1.9 mm
average per day
Moderate
wet-ground risk
Expect at least one passing shower over the weekend. Some ground gets sloppy, but you're never far from shelter or a way home.
Rain day by day
| Day | Rain | High | Weather score |
|---|---|---|---|
| Fri 7 Aug | 2.2 mm | 22°C | 94% |
| Sat 8 Aug | 1.2 mm | 22°C | 97% |
| Sun 9 Aug | 2.4 mm | 21°C | 94% |
The wettest festival day on average is Sun 9 Aug at 2.4mm; the driest is Sat 8 Aug at 1.2mm. Over the main days that adds up to roughly 5.8mm.
What rain actually does to Flow
The industrial site has plenty of indoor stages and covered areas, so a wet day shifts the crowd rather than ending the night. The cool, low-humidity Nordic air is one of Flow's signature features — comfortable dancing weather even when crowds are dense, and a hoodie is the standard third layer after dark.
If the forecast turns wet
- Waterproof shoes over trainers — you'll be on wet pavement and grass all day.
- Rain jacket for walking, poncho for standing in a crowd with a backpack.
- No campsite here, so the fix for a bad hour is indoors, under cover, or an early trip home and back.
- A dry bag for phone, power bank and tickets, and dry clothes waiting at home.
How we know
These numbers come from the Open-Meteo historical reanalysis at the festival's coordinates, averaged day by day over about 15 years. They describe a typical edition, not the one you're going to — for the live picture, the Flow forecast page updates twice a day once the event is inside the forecast window.